PLATE LXXVIII. 



PIG. 



1. HIPPURARIA EGERTONI, p. 549; portion of the erect 



stem, with whorls of cells. 



2. , a zooscium, much enlarged, showing the 



ventral aperture. 



3. , showing the degree in which the cell can 



be bent. After a sketch by Sir P. Egerton. 



4. , nat. size *. 



5. FARRELLA REPENS, p. 529. After Van Beneden. 



6. , form ELONGATA. Ditto. 



* Figs. I, 2, and 4 are after Busk. 



